Enable or disable "Show Hidden Folders".

Registry path to enable or disable "Show Hidden Folders" in Folder Options.

1. Open Regedit through run.

2. Navigate to the path:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced

3. Change the value of "Hidden" to 1 inorder to enable and viceversa and restart the computer to apply changes effectively.

This works for Vista,7 & 8.